I have a venturi with three holes. Two large for the water flow and
another small one with about 12" of air pipe coming of it. what do I
do with this pipe and can it be longer. Do I attach it to my air pump.

A venturi is surely meant to 'suck' air and therefore doesnt need a pump but I suppose that depends on how deep the venturi is placed

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I have a venturi with three holes. Two large for the water flow and
another small one with about 12" of air pipe coming of it. what do I
do with this pipe and can it be longer. Do I attach it to my air pump.


If the venturi action is set up properly, no airpump is needed, the venturi
action will draw the air into the system. I have a gravity fed venturi that
injects air into water stream, and I can see a small stream of bubbles pop
out from under the discharge.

An air pump will provide greater air pressure, and allow you to inject more
air into the stream. Try it with out air first, you can always connect it to
your air pump later on.

-S